Table 3.
Results of the test–retest reliability of hard workers to assess the risk of CKDu: Interclass correlation coefficient (ICC), kappa and percentage agreement (item-specific)
| Item (per part of the questionnaire) | Test–retest reliability | Usability | ||
|---|---|---|---|---|
| ICC (95% CI) | Kappa | Agree | ||
| 1. Personal information | ||||
| Previous occupation | 1.00 (1.00–1.00) | / | 100.0 | √ |
| Family history of kidney disease | 0.93 (0.91–0.95) | / | 87.5 | √ |
| Family history other than kidney disease | 0.97 (0.96–0.98) | / | 94.9 | √ |
| Past medical history | 0.99 (0.98–0.99) | / | 98.7 | √ |
| Past medication history | 0.99 (0.98–0.99) | / | 98.7 | √ |
| Social history | 0.96 (0.94–0.97) | / | 92.7 | √ |
| 2. Past health issues | ||||
| History of kidney problems at birth | 1.00 (1.00–1.00) | / | 100.0 | √ |
| Diagnosis of kidney disease | 0.93 (0.91–0.95) | / | 86.7 | √ |
| History of anaemia or low haemoglobin levels | 0.99 (0.98–0.99) | / | 98.0 | √ |
| Bone or joint pain | 0.98 (0.97–0.98) | / | 96.0 | √ |
| Issues during urination in the past | 1.00 (1.00–1.00) | / | 100.0 | √ |
| Urine test past 1 year | 0.98 (0.97–0.98) | / | 96.8 | √ |
| Urinary infections in the past | 0.96 (0.95–0.97) | / | 93.4 | √ |
| Renal calculus | 1.00 (1.00–1.00) | / | 100.0 | √ |
| Exposure to scan or radiation | 0.98 (0.98–0.99) | / | 97.5 | √ |
| Swelling of face and legs | 1.00 (1.00–1.00) | / | 100.0 | √ |
| Type of medicine generally used | 1.00 (1.00–1.00) | / | 100.0 | √ |
| Vitamin supplements used without doctor’s advice | 0.98 (0.97–0.98) | / | 100.0 | √ |
| Salt restricted diet advice from healthcare provider | 1.00 (1.00–1.00) | / | 100.0 | √ |
| Fluid restricted diet from healthcare provider | 1.00 (1.00–1.00) | / | 100.0 | √ |
| 3. Agrochemicals | ||||
| Cultivate vegetables and fruits | 0.99 (0.98–0.99) | / | 98.8 | √ |
| Pesticides for cultivation | 0.99 (0.98–0.99) | / | 98.6 | √ |
| Using protection while using fertilisers | 0.98 (0.97–0.98) | / | 96.4 | √ |
| Storing pesticides at home premises | 1.00 (1.00–1.00) | / | 100.0 | √ |
| Insecticides for mosquitoes and mites at home | 1.00 (1.00–1.00) | / | 100.0 | √ |
| Pets at home | 1.00 (1.00–1.00) | / | 100.0 | √ |
| Washing hands after returning home | 1.00 (1.00–1.00) | / | 100.0 | √ |
| 4. Occupation | ||||
| Number of working days in a week | 0.99 (0.98–0.99) | / | 95.5 | √ |
| Number of working hours in a day | 1.00 (0.99–1.00) | / | 97.2 | √ |
| Type of work | 1.00 (1.00–1.00) | / | 100.0 | √ |
| Quantity of hydration | 0.98 (0.98–0.99) | / | 93.5 | √ |
| Frequency of urination | 0.99 (0.98–0.99) | / | 93.7 | √ |
| 5. OTC Medications | ||||
| Self-medicating for minor ailments | 1.00 (1.00–1.00) | / | 100.0 | √ |
| Home remedies for general ailments | 1.00 (1.00–1.00) | / | 100.0 | √ |
| Self-medicating on pain medications | 1.00 (1.00–1.00) | / | 100.0 | √ |
| 6. Drinking water | ||||
| Source of drinking water | 1.00 (1.00–1.00) | / | 100.0 | √ |
| Cleaning of well | 0.99 (0.98–0.99) | / | 98.2 | √ |
| Well water mixing with ground water | 0.95 (0.92–0.93) | / | 90.4 | √ |
| Water purifier for drinking water | 1.00 (1.00–1.00) | / | 100.0 | √ |
| Non-availability of purifier | 1.00 (1.00–1.00) | / | 100.0 | √ |
| Nearby industries | 0.93 (0.91–0.95) | / | 87.6 | √ |
| Cattle and poultry farming | 0.99 (0.98–0.99) | / | 98.7 | √ |
| 7. Heat stress | ||||
| Exposure to sunlight | 0.98 (0.98–0.99) | / | 97.5 | √ |
| Protection from heat | 0.99 (0.98–0.99) | / | 98.8 | √ |
| 8. Air pollution | ||||
| Disposal of waste | 1.00 (1.00–1.00) | / | 100.0 | √ |
| Source of gas | 1.00 (1.00–1.00) | / | 100.0 | √ |
| Traditional ways of cooking | 1.00 (1.00–1.00) | / | 100.0 | √ |
| Cooking in steel vessels | 0.93 (0.91–0.95) | / | 87.5 | √ |
| Cooking in mud vessels | 0.99 (0.98–0.99) | / | 98.5 | √ |
| Cooking in aluminium vessels | 0.98 (0.97–0.98) | / | 96.0 | √ |
| Cooking in copper vessels | 1.00 (1.00–1.00) | / | 100.0 | √ |
| Cooking in non-stick vessels | 0.99 (0.98–0.99) | / | 98.6 | √ |
| Cooking in iron vessels | 0.97 (0.96–0.97) | / | 94.3 | √ |
| 9. Worm infestations | ||||
| Practice of deworming | 0.98 (0.97–0.98) | / | 97.0 | √ |
| History of worm infestations | 1.00 (1.00–1.00) | / | 100.0 | √ |
| Management for worm infestations | 0.99 (0.98–0.99) | / | 98.5 | √ |
| 10. Food and nutrition | ||||
| Diet | 0.97 (0.96–0.98) | / | 89.5 | √ |
| Preserve food at home | 1.00 (1.00–1.00) | / | 100.0 | √ |
| Storing food or water for long term in aluminium | 0.88 (0.84–0.91) | / | 79.7 | √ |
| Storing food or water for long term in mud | 0.98 (0.98–0.99) | / | 97.2 | √ |
| Storing food or water for long term in steel | 0.98 (0.97–0.98) | / | 96.1 | √ |
| Consuming soft drinks or soda | 0.99 (0.98–0.99) | / | 98.7 | √ |
| Consume tea or coffee | 0.99 (0.98–0.99) | / | 95.2 | √ |
| Frequency of eating commercially prepared or restaurant food | 0.99 (0.98–0.99) | / | 98.0 | √ |
| Habit of skipping meals | 0.96 (94.9–97.2) | / | 92.7 | √ |